High pressure boiler including a water tube lined fire box, particularly for locomotives



P 1934- H. NYFFENEGGER 1,974,505

HIGH PRESSURE BOILER INCLUDING A WATER ,TUBE LINED I FIRE BOX, PARTICULARLY FOR LOCOMOTIVES Filed March 1, 1953 Patented Sept. 25, 1934 Y UNITED- STATES PATENT OFFICE HIGH PRESSURE BOILER INCLUDING A 'WATEB. TUBELINED FIRE BOX, PARTICU- LABLY FOR, LOCOMOTIVES Hans Nyfienegger, Winterthur, Switzerland, .assigner tohthe firm Schweizerische Lokomotivund Maschinenfabrik, Winterthur, Switzerland *Application March: 1, 1933, Serial No. 659,190 anr mh 3 9 4 Claims.. (Cl, 122-460) This invention relates to high-pressure boilinthe upward direction through an opening in em including a water tube lined fire, box, particuthe chamber normally closed bya cover 1., a cor-I larly for locomotives. responding cover 151 being provided in the shell of With high-pressure steam locomotives includthe boiler. Lateral doors 2 and t2 in the chamber 7 5 ing a water tube fire box the construction and f and the boiler shell respectively provide access 6 0 arrangement of the heating surface of the boiler to the chamber f, when it is to be cleaned by to. be combined with the fire box and the combusblasting or in other manner. The rearward flue tion chamber in a manner to satisfy all technical gas chamber is provided with doors on all sides requirements as regards heat distribution, 'confor giving access, when the chamber is to. be

10- struction, and operation is a matter of considercleaned by blasting or in other manner. 6 5

able difficulties. v a v Discharge, spouts Z for cinders are arranged According tothepresent invention these diffion the bottom of the chamber 1 and. permit of culties are met in a boiler of the abovesaid type removing the. cinders, that ma Collect thereat including aflue ga v heated low pressure feed waduring the operation. Between the smoke tubes 15, terpreheater by disposing the superheater in a n of the low pressure feed water preheaterthe 7Q.

" rearward flue gas chamber situated between the tube elements 0 of the high-pressure feed water low pressure feed water preheater and. the high preheater are inserted. pressure portion of the boiler and arranging a Admittedly,it is already known with the usual high-pressure feed water preheater in intereng aglow pressure locomotive boilers including water ing disposition with the smoke tubesof the low tubes or smoke tubes resp ively t Pass the 7 5 pressure feed water preheater. feed waterthrough a feed water preheater ar- In the accompanying drawing constructional ranged between the smoke or water tubes of forms of the invention are schematically exemplithe boiler prior to its. entry into the boiler proper fied, in which y m an of a pump. These known arrange- Fig, 1 is a longitudinal section of the boiler, ments are, hOWGVBI, fundamentally different 80. Fig. 2 is a section on the line II-.II in Fig. 1; from the arrangement according to the inven- Fig. 3 is a section on the line I II -IIl1 of Fig. 1; tion in so far, as with the latter the feed water Fig. 4 shows a modification of thElQW pressure is forced into the high pressure feed water pre feed water preheater. heater after leaving the low pressure preheater, Fig, 5 is a perspective view showing the manin the form of a. smoke tube boil r, by means of 5 ner in which the feed ,water preheater or Fig 1 a nt en ump and connecting pipes 111.,

s connected nan 2/ an a. the ig r s re b in di posedbe- Fig. 6 is a similar view. as Fig. 5 for the modified tween the smoketubes of the low pressurepre ed wa r a r at hea r ssociated with the high pressure pre- 5. Referring to the drawing, the portion of the heater. From the high p es ur p heat r h 9 0 boiler for generating thehigh-pressure steam is Water is passed to the. upper steam collecting shown to include, in a known mannentwo upper drums hIQ g ip s 2/4, 3 The pressure pre-' steam collecting drums at, four lower wate drums ve l n t i h pr ssur prehe t r is s vb, three sleeve stayed water filled plate wall d and era times that of the low pressure preheater (for 40 water tubes 0 which form the sides of the fire example 60 atmospheres as against lg to 15 5 box and the combustion chamber and protect tmosphe so th at r and us 3 1 2 feed the upper drums from direct heating e repre W t te era r a a n d in the high pres-- sents the grate. A flue gas heated low pressure sur e ete i 8 t 9 d rees 0. h e feed water preheater m is secured foregample by than hat Of the low pressure pro heater. The

a rigid screw connection m1 toa chamber i sitspi al u e elements Q th h sh essure feed me uated in front of the high-pressure steam generwa er pre at ma beconnec ed u n di er: ating portion and screwed thereto also in a rigid en w ys. The entrance and exit headers n and manner (the other connectionjnot being shown q O th g P1 55 1 3 1 761 63 61 are E her both in the drawing). The chamber J accommodates disposed in .the chamber g (Figs. land 5 or spi a superheater an a'fluegas' chamber 9 separately rra ed h chambers I and a 105 comprises the customar'yblast nozzle appliance h respectively (Figs. i and 6). With the latter for promoting the combustion. The chamber arrangement a relative flow of the feed water is lined. on the inner side of its shell with fireand the fiue gases similar to that provided by proof material. The superheater i which is asthe counter course principle is obtained. The

. sumed to be a spiral superheater can be removed proportion of the heating surfaces of the low 119 and high pressure preheater is sochosen that in the low pressure preheater no low pressure steam at all is generated or else only an amount which is necessary for driving the feed pumps and auxiliary apparatus thereof. On the contrary, in the high pressure preheater the hot water withdrawn from the low pressure preheater by means of the pump is heated up to the temperature of saturation of the high pressure boiler and under certain circumstances even evaporated in small quantities. This desired eifect is attained, when for example with a pressure in the high pressure boiler of atmospheres and 15 atmospheres in the low pressure preheater the proportion of the heating surface of the high pressure preheater is approximately 1.3 to 1.5 times that of the low pressure preheater. Thus the low pressure feed water preheater serves merely for preheating the feed water and for separating out sludge. The feed of the low pressure preheater is effected in the usual manner by means of pumps or injectors (not shown).

The low pressure smoke tube preheater is equipped with a steam collector s for supplying the steam for driving the last-mentioned feed pumps or injectors, and with safety valves 1" and a water column :r.

The relative arrangement of the heating surfaces and the mode of connecting up these surfaces provide a high efi'lciency for the boiler. At the same time sealing the passages for the flue gases and cleaning the same is considerably facilitated. The boiler according to the invention is of an extraordinarily simple construction and reliable in operation. As this result is obtained with the aid of known elements hitherto used to advantage in locomotive work, the boiler according to this invention is adapted for general application in connection with locomotives.

I do not limit myself to the particular size, shape, number or arrangement of parts as shown and described, all of which may be varied without going beyond the scope of my invention as tion, a water tube lined fire box and combustion chamber comprising parts of a high pressure portion of the boiler and supp-lying substantially the whole steam energy consumed in the locomotive, a flue gas heated fire tube type low pressure feed water preheater generating at the most a slight percentage amount of low pressure steam energy, a flue gas chamber provided between said combustion chamber and said low pressure feed water preheater, a superheater for the steam generated in said lining of said fire box and said combustion chamber accommodated in said flue gas chamber, a high pressure feed water preheater interengaging with the fire tubes of said low pressure feed water preheater and receiving its water supply from said low pressure preheater, and a pump intercalated between said low pressure preheater and said high pressure preheater, for supplying the latter with water from the former.

2. In a high pressure boiler of the type described particularly for locomotives in combination, a water tube lined fire box and combustion chamber comprising parts of a, high pressure portion of the boiler and supplying substantially the whole steam energy consumed in the locomotive, a flue gas heated fire tube type low pressure feed water preheater generating at the most a slight percentage amount of low pressure steam energy, a flue gas chamber provided between said combustion chamber and said low pressure feed water preheater, a superheater for the steam generated in said lining of said fire box and said combustion chamber accommodated in said flue gas chamber, a high pressure feed water preheater interengaging with the fire tubes of said low pressure feed water preheater, the heating surface of the high pressure preheater being larger than that of the low pressure preheater, and a pump intercalated between said low pressure preheater and said high pressure preheater, for supplying the latter with water from the former.

3. In a high pressure boiler of the type described particularly for locomotives in combination, a water tube lined fire box and combustion chamber comprising parts of a high pressure portion of the boiler and supplying substantially the whole steam energy consumed in the locomotive, a flue gas heated fire tube type low pressure feed water preheater generating at the most a slight percentage amount of low pressure steam energy, a flue gas chamber provided between said combustion chamber and said low pressure feed water preheater, a spiral superheater for the steam generated in said lining of said fire box and said combustion chamber accommodated in said flue gas chamber, a high pressure feed water preheater interengaging with the fire tubes of said low pressure feed water preheater and receiving its water supply from said low pressure preheater, and a pump intercalated between .said low pressure preheater and said high pressure preheater, for supplying the latter with water from the former.

4. In a high pressure boiler of the type described particularly for locomotives in combination, a water tube lined fire box and combustion chamber comprising parts of a high pressure portion of the boiler and supplying substantially the whole steam energy consumed in the locomotive, a flue gas heated fire tube type low pressure feed water preheater generating 'at the most a slight percentage amount of low pressure steam energy, a fiue gas chamber provided between said combustion chamber and said low pressure feed water preheater and firmly connected to both of said parts, an upper wall) in said chamber, a removable cover provided in said upper wall of said chamber, a spiral superheater for the steam generated in said lining of said fire box and said combustion chamber removably accommodated in said chamber and adapted to be passed out through an aperture normally closed by said cover, a high pressure feed water preheater interengaging with the fire tubes of said low pres sure feed water preheater, the heating surface of the high pressure preheater being approximately 1.3 to 1.5 times larger than that of the, low pressure preheater, and a pump intercalated between said low pressure preheater and said high pressure preheater, for supplying the latter with water from the former.

HANS NYFFENEGGER.

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